Pbedebick hiebgesell



F. HIERGESELL.

BURETTE.y

APPLICATION FILED SEPT. 25. |918.

Patented Aug. 26, 19.19.

FREDERICK HIERGESELL, 0F NEW YORK, N. Y.

BURETTE.

Specification of Letters Patent.

Patented Aug. 26, 1919.

Application filed September 25, 1918. Serial No. 255,720.

To all lwhom 'it may concern.'

Be it known that I, FREDERICK HuntelasnLL, a citizen of Germany, and aresident of New York city, in the county and State of New York, 'haveinvented certain new and useful Improvements in Burettes, of which thefollowing is a specification.

This invention relates to a burette of novel construction and moreparticularly to novel and eiiicient means for applying the scalealongside the body thereof, and protecting the same against acids andother deleterious agents.

In the accompanying drawings- Figure 1 is a longitudinal section partlyin side view of a lburette embodying my invention;

Fig. 2 Fig. 1;

Fig. 8, a longitudinal section partly in side view of a modification,and

Fig. 4, a cross section on line 4-4 of Fig. 3.

The glass tube 1 constituting the body of the burette is open on top,and runs out at its lower end into a nozzle 2, controlled by a stop cock3, all as usual. To the face of tube 1, is pasted a strip 4 of paper orother flexible material bearing a scale 5. In order to inclose andprotect thescale, tube 1 is surrounded by a second glass tubeconstituting a transparent casing 6, through which the scale, which isconfined between the tubes, is visible. Casing 6 is curved at its bottomin parallelism with the rounded bottom of tube 1, to which it is fusedas at 7 so that the nozzle 2 protrudes from the fused end of the casing.The upper end of the latter is straight, and is fused to thecorresponding end of tube 1 as at 8. If desired, tubes 1 Yand 6 may beslightly distanced to form an intervening space from which the air isexhausted, in order to maintain the liquid passing through the burette,at an even temperature.

In manufacturing the device, a cylindrical glass tube is projected overthe body of a cross section on line 2-2 of the burette, its lower end isheated, contracted and rounded and both ends are fused to the burettebody as previously stated.

The strip 4 should be mounted in such a manner that its reading edge iscoincident with the axis of the nozzle 2. Thus when the burette ischarged, such reading edge will be in line with the bottom of themeniscus of the liquid when the apparatus is held in the position shownin the drawing so that an accurate reading may be had.

With the embodiment illustrated in Figs. 3 and 4, the strip 4 isomitted, the scale 9 being marked directly upon the body of tube 1.

It will be seen that by the construction described, the scale is incasedin such a manner as to be effectively protected against acids orabrasion, and that at the same time, the body of the burette isreinforced to a desirable extent, while the nozzle and stop cock remainunencumbered.

Moreover, if the scale is applied by means of the incased strip 4, theapplication of the glraduations to the burette is greatly simplied andcheapened.

I claim:

1. A burette comprising a glass tube open at one end and having acock-controlled nozzle at the other end, a scale and a glass casingsurrounding said tube and inclosing said scale, said casing having itsopposite ends flush with the open end of said tube and 4with the innerend of said nozzle respectively and being fused to said tube only atthese points.

2. A burette comprising a glass tube having a cock-controlled nozzle atone end, a transparent casing surrounding said tube and terminating atthe inner end of said nozzle, said casing and tube being connected onlyat the opposite ends of said casing and a scale located between saidtube and casing and having its indicating edge in registry with the axisof said tube.

3. A burette comprising a glass tube having a cock-controlled nozzle atone end, a transparent casing surrounding said tube and connectedtherewith, and a graduated scale strip interposed between said tube andcasing and located entirely to one side of the axis of said tube withits indicating edge in registry `with said axis.

rnlnnnnrcn HIERGESELL.

Begles et this patent may be obtained for ive dents cach, by'afddir'eiiixig the "Oommiullnner' o! Intenta; warmem, n. aff

